The steam-api64r.dll error in Mortal Kombat X is annoying but harmless—it’s just your security software being too aggressive. Restore the file from quarantine, add a game folder exclusion, and you’ll be back to performing X-Rays in no time.
Did this fix your issue? Let me know in the comments, or share which antivirus caused the problem for you.
Enjoying MKX on PC? Don’t forget to turn off “Hardware Physics” if you experience slowdowns—it’s a known performance killer. steam-api64r.dll missing mortal kombat x
Work through these methods in order. Method 1 resolves the issue for 80% of users.
The Steam client service itself may be outdated. This does not delete your games. The steam-api64r
If the file is simply corrupted or missing, Steam can replace it automatically.
Note: If Steam fails to download the file, move to Method 3. Enjoying MKX on PC
The file steam-api64r.dll is a legitimate part of Mortal Kombat X’s crack-proofing (even in the legit Steam version). It helps the game communicate with Steam’s servers.
The main culprit: Overzealous antivirus software (especially Avast, AVG, and Windows Defender) sometimes flags this DLL as a false positive and quarantines or deletes it. The game then can’t find it, and you get the error.
Do NOT download the DLL from a website. Downloading random DLLs from the internet is a security risk and often causes more errors. Instead, restore the original file safely: